It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 31 789 is not a prime number.
For example, 31 789 can be divided by 83: 31 789 / 83 = 383.
For 31 789 to be a prime number, it would have been required that 31 789 has only two divisors, i.e., itself and 1.
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31 789 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 31 789 is about 178.295.
Thus, the square root of 31 789 is not an integer, and therefore 31 789 is not a square number.
The square of a number (here 31 789) is the result of the product of this number (31 789) by itself (i.e., 31 789 × 31 789); the square of 31 789 is sometimes called "raising 31 789 to the power 2", or "31 789 squared".
The square of 31 789 is 1 010 540 521 because 31 789 × 31 789 = 31 7892 = 1 010 540 521.
As a consequence, 31 789 is the square root of 1 010 540 521.
The multiples of 31 789 are all integers evenly divisible by 31 789, that is all numbers such that the remainder of the division by 31 789 is zero. There are infinitely many multiples of 31 789. The smallest multiples of 31 789 are: